- AFriday, 21 May
- BMonday, 12 April
- CThursday, 20 May
- DFriday, 14 May
Step-by-Step Solution
100 working days = 20 full Monday–Friday weeks, so day 100 is the Friday of the 20th week: 4 January + 19 weeks + 4 days = 4 January + 137 days. January has 27 more days (to the 31st), February 28 (55), March 31 (86), April 30 (116), and 21 more reach 21 May. (Monday, 12 April adds just 100 calendar days.)
Answer: A) Friday, 21 May